Maybe she doesn't like the litter, or the box (especially if it's covered) or the location of the box. Some cats don't like to pee and poop in the same box, so a second litter box might be needed. Your mom's room would probably be a good place for it to start.
You can try Cat Attract litter. Also...are you scooping a minimum of once a day? She may not like going in a box that has already been used, so you may have to scoop more often...or the second box fix that.
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Holly, Misty & their friend, Jake, the dog.
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